CN212255009U - Device for testing salt spray corrosion resistance of steel wire in stress state - Google Patents
Device for testing salt spray corrosion resistance of steel wire in stress state Download PDFInfo
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- CN212255009U CN212255009U CN202020473995.4U CN202020473995U CN212255009U CN 212255009 U CN212255009 U CN 212255009U CN 202020473995 U CN202020473995 U CN 202020473995U CN 212255009 U CN212255009 U CN 212255009U
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Abstract
The utility model relates to a device for testing the salt spray corrosion resistance of a steel wire in a stress state, which comprises a top plate, a bottom plate and a steel wire loading screw rod, wherein the top plate and the bottom plate are arranged in parallel; the top plate and the bottom plate are respectively provided with corresponding steel wire holes which are uniformly arranged at intervals, the lower plane of the top plate is provided with a screw rod positioning mechanism, the bottom plate is provided with a bolt hole corresponding to the screw rod positioning mechanism, the tail end of the steel wire loading screw rod is positioned by the screw rod positioning mechanism, the head part of the steel wire loading screw rod penetrates through the bolt hole on the bottom plate, and the steel wire loading screw rods on the upper side and the lower side of the bolt hole on the bottom plate are respectively provided with a loading nut and a locking; the steel wire as the inspection object sequentially passes through the corresponding steel wire holes on the top plate and the bottom plate, and two ends of the steel wire are respectively fixed by the anchor cups. The utility model discloses a loading screw fastens and maintains stress state to the steel wire with parallel arrangement's roof, bottom plate cooperation, can overcome the unable difficult problem of maintaining stress state for a long time of steel wire.
Description
Technical Field
The utility model belongs to the technical field of the experimental test of steel wire, especially, relate to a device of anti salt fog corrosivity ability of inspection steel wire under stress state.
Background
The development stage of the large-span bridge construction in our country is in a sudden and violent development since the innovation is open, particularly, large-span cable-stayed bridges and suspension bridges are still in the vogue, and the design and construction level of the bridge in our country enters an advanced line. However, problems arise, and one of the disadvantages of the durability and safety of the bridge cable structure is faced. Meanwhile, the country is building a conservation-oriented society, the improvement of the durability of the engineering structure is an effective measure for saving engineering construction resources, and the prolonging of the service life of the engineering is the maximum resource saving. With the development of material technology, corrosion of bridge cables is a major factor leading to their failure. For bridge cables in marine environments, the above problems are more pronounced. The corrosion resistance of the traditional bridge cable steel wire is mainly detected and evaluated by adopting an accelerated salt spray test, the method can better simulate the ocean and chloride ion environment, and the test result has a certain reference value. However, since the bridge cable steel wire is always in a complex stress state, the corrosion of the steel wire under the combined action of stress and a corrosion medium is accelerated. Stress corrosion has the following characteristics: there is a tensile stress, the greater the tensile stress the faster the corrosion. A certain tensile stress is a necessary condition for stress corrosion cracking to occur. Generally, the greater the stress, the shorter the time for corrosion cracking to occur, and less than a certain stress value, referred to as the critical value of stress corrosion, cracking does not occur. The stress corrosion is directly related to the coating of the steel wire, the diameter of the steel wire and the strength of the steel wire. The traditional salt spray test method cannot simulate stress corrosion under complicated stress conditions above steel wires, so the test result has certain limitation on the evaluation of the durability of the cable of an actual bridge.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a device of anti salt fog corrosion ability of inspection steel wire under stress state is provided to above-mentioned prior art, can effectively assess the cable durability of actual bridge.
The utility model provides a technical scheme that above-mentioned problem adopted does: a device for testing the salt spray corrosion resistance of a steel wire in a stress state comprises a top plate, a bottom plate and a steel wire loading screw rod, wherein the top plate and the bottom plate are arranged in parallel;
the top plate and the bottom plate are respectively provided with corresponding steel wire holes which are uniformly arranged at intervals, the lower plane of the top plate is provided with a screw rod positioning mechanism, the bottom plate is provided with a bolt hole corresponding to the screw rod positioning mechanism, the tail end of the steel wire loading screw rod is positioned by the screw rod positioning mechanism, the head part of the steel wire loading screw rod penetrates through the bolt hole on the bottom plate, and the steel wire loading screw rods on the upper side and the lower side of the bolt hole on the bottom plate are respectively provided with a loading nut and a locking;
the steel wire as the inspection object sequentially passes through the corresponding steel wire holes on the top plate and the bottom plate, and two ends of the steel wire are respectively fixed by the anchor cups.
Preferably, the top plate and the bottom plate are stainless steel plates with the thickness of 20 mm-60 mm.
Preferably, the diameter of the steel wire holes is phi 5 mm-phi 9mm, and the distance between the steel wire holes is more than 125mm
Preferably, the screw rod positioning mechanism is a counter bore which is pre-processed on the lower surface of the top plate, the diameter of the counter bore is 1.05-1.10 times of the diameter of the anchor cup, and the depth of the counter bore is 2-3 mm.
Preferably, the bolt holes are through holes with the diameter of 20 mm-30 mm, and the distance is more than 140 mm.
Preferably, pier heads are formed at two ends of the steel wire, the diameter of each pier head is not less than 1.5 times of the diameter of the steel wire, and the height of each pier head is not less than 1 time of the diameter of the steel wire.
Preferably, the anchor cup is a steel wire monofilament anchor cup with a through hole in the center, wherein the outer diameter of the anchor cup is phi 25mm, the diameter of the through hole is phi 5 mm-phi 8mm, the anchor cup is processed by adopting a strength material with a steel grade of more than 45, and heavy anti-corrosion paint is coated for corrosion prevention after processing, or stainless steel is adopted.
Preferably, a pressure sensor is arranged between the anchor cup at the lower end of the steel wire and the lower surface of the bottom plate, and the bottom end of each steel wire is respectively and independently provided with the pressure sensor.
Compared with the prior art, the utility model has the advantages of:
1. the utility model discloses a loading screw fastens and maintains stress state to the steel wire with parallel arrangement's roof, bottom plate cooperation, can overcome the unable difficult problem of maintaining stress state for a long time of steel wire.
2. The utility model discloses can realize the corrosion test under the different stress condition, be particularly useful for the long-term environment condition of corroding.
3. The utility model discloses a stress and corrosion integrated structure, the frock is simple, easy and simple to handle, practice thrift the space, can carry out the multiunit simultaneously in the laboratory and test.
Drawings
Fig. 1 is a schematic structural diagram of a top plate in an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a bottom plate in the embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a loading screw in an embodiment of the present invention.
Fig. 4 is a schematic structural view of the steel wire bonding inspection anchor cup in the embodiment of the present invention.
Fig. 5 is the embodiment of the present invention, which is a schematic structural view of the steel wire for inspection installed on the top plate.
Fig. 6 is a schematic structural diagram of the embodiment of the present invention in which the test wire and the loading screw are mounted on the top plate and the bottom plate (the lower anchor cup is not mounted).
Fig. 7 is a schematic structural view of an anchor cup in an embodiment of the present invention.
Fig. 8 is a schematic structural diagram of the embodiment of the present invention in which the inspection steel wire and the loading screw are installed on the top plate and the bottom plate.
Fig. 9 is a schematic structural diagram of the embodiment of the present invention in which the pressure sensor is installed.
Fig. 10 is a schematic structural diagram of the device placed in the salt spray resistant box according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The embodiment provides a device for testing salt spray corrosion resistance of a steel wire in a stress state, which comprises a top plate 1, a bottom plate 2 and a steel wire loading screw rod 3,
as shown in figure 1, the top plate 1 is a stainless steel plate with a thickness of 20 mm-60 mm, a group of steel wire holes with a diameter of 5 mm-9 mm are processed on the stainless steel plate at certain intervals, and the distance between the steel wire holes is more than 125mm, so that a plurality of groups of steel wires can be conveniently anchored. The lower plane of the top plate 1 is provided with a screw positioning mechanism, so that the screw is perpendicular to the upper top plate during assembly, and the screw is prevented from being inclined to influence the stress of the steel wire. The positioning mechanism is a counter bore which is processed in advance for an upper top plate. The diameter of the counter bore is 1.05 to 1.10 times of the diameter of the anchor cup, and the depth of the counter bore is 2 to 3 mm.
As shown in figure 2, the bottom plate 2 is also made of a stainless steel plate with the thickness of 20 mm-60 mm, a group of steel wire holes with the thickness of phi 5 mm-phi 9mm are processed on the stainless steel plate at certain intervals, and the distance between the steel wire holes is more than 125mm, so that a plurality of groups of steel wires can be conveniently anchored. The top plate 1 and the bottom plate 2 are arranged in parallel, and the steel wire holes are arranged correspondingly. And bolt holes are formed in the bottom plate 2 at positions corresponding to the counter bores of the top plate 1, the bolt holes are through holes with the diameters of 20 mm-30 mm, the distance between steel wire anchoring holes is considered, and the distance between the bolt holes is more than 140mm, so that the bolt holes can conveniently penetrate through the steel wire loading screw rods 3.
As shown in fig. 3, the loading screw 3 is a stainless steel bolt with a diameter not less than 20mm, and two nuts are arranged on the stainless steel bolt, wherein one nut is used for loading and the other nut is used for self-locking.
As shown in fig. 4 to 5, the steel wire 6 as the inspection object passes through the corresponding steel wire holes of the top plate 1 and the bottom plate 2 in sequence, both ends of the steel wire 6 are fixed by the anchor cups 7, respectively, and the steel wire 6 is fixed between the top plate 1 and the bottom plate 2. Pier heads are formed at two ends of the steel wire 6, the diameter of each pier head is not less than 1.5 times of the diameter of the steel wire, and the height of each pier head is not less than 1 time of the diameter of the steel wire.
As shown in fig. 6, the tail end of the wire loading screw 3 is placed in a counter bore as a screw positioning mechanism, the head part passes through a bolt hole on the bottom plate 2, and a loading nut 4 and a locking nut 5 are respectively arranged on the wire loading screw 3 on the upper side and the lower side of the bolt hole on the bottom plate 2.
As shown in fig. 7, the anchor cup 7 is a steel wire monofilament anchor cup with a through hole at the center, wherein the outer diameter of the anchor cup is phi 25mm, and the diameter of the through hole is phi 5 mm-phi 8mm, so that a steel wire can conveniently pass through the through hole. The anchor cup is made of a strength material with a steel grade of more than 45, and is coated with heavy anti-corrosion paint for corrosion prevention after being processed, or is made of stainless steel.
As shown in fig. 8, in order to equalize the loading stress applied to each set of steel wires, the steel wire loading screws 3 and the steel wires 6 are arranged on the top plate 1 and the bottom plate 2 at equal intervals, in the embodiment, there are four sets of steel wires 6 and three sets of steel wire loading screws 3, and each set of steel wire loading screws 3 is respectively arranged between two adjacent sets of steel wires 6.
As shown in fig. 9, for the convenience of detecting the load on the steel wire and ensuring the consistency of the steel wire load, a pressure sensor 8 is arranged between the anchor cup 7 at the lower end of the steel wire 6 and the lower surface of the bottom plate 2, and the bottom end of each steel wire is respectively and independently provided with the pressure sensor 8, so that when a stress test is performed, the load on each steel wire can be effectively and visually monitored through the loading nut 4 on the steel wire loading screw rod 3, and whether the load on each steel wire is consistent can be found on the other hand, so that the adjustment is convenient, and the accuracy of the test is ensured.
The embodiment provides an implementation method of the test device, which comprises the following steps:
1) firstly, the steel wire penetrates through the top plate and the anchor cup above the top plate, and then the upper end of the steel wire is upset. The upset diameter is no less than 1.5 times the wire diameter and the upset height is no less than 1 time the wire diameter as shown in figure 5 below.
2) The loading nut is screwed into the lower part of the steel wire loading screw at a proper position, and the tail end of the steel wire loading screw is placed in the counter bore on the lower surface of the top plate, as shown in fig. 6.
3) The bottom plate is inserted from the bottom ends of the steel wire and the steel wire loading screw rod, so that the loading nut is positioned above the bottom plate, then the distance between the top plate and the bottom plate is adjusted by screwing the loading nut, after the loading nut is adjusted to a proper position, the locking nut is screwed into the steel wire loading screw rod, and the steel wire loading screw rod is pre-tightened, as shown in fig. 6.
4) The anchor cup below the bottom plate is penetrated into the steel wire, and then the lower end of the steel wire is upset, wherein the diameter of the upset is not less than 1.5 times of the diameter of the steel wire, and the height of the upset is not less than 1 time of the diameter of the steel wire, as shown in figure 8.
5) Marking or attaching a strain gauge on the steel wire, and finally screwing a locking nut on the loading screw rod to load the steel wire to 45% -70% of the steel wire breaking load, as shown in fig. 8. Scales or other marks are not required to be arranged on the screw rods, and uniform force application of the plurality of screw rods is guaranteed.
6) Finally, the assembled device is placed into a salt spray box to carry out a salt spray test, so that a (comparative) simulation test of stress corrosion of the bridge cable in a high-strength steel wire stress state is realized, and the test is shown in fig. 10.
As shown in fig. 9, the steel wire stress elongation method or the installation of the pressure sensor is adopted in the test process to ensure that the load on the steel wire is consistent. When the loads on the steel wires are inconsistent, the upper nut and the lower nut on the screw rod are adjusted until the loads acting on the steel wires are basically consistent.
If the mode of installing the pressure sensor is adopted, the pressure sensor is protected from salt mist corrosion in the salt mist test process.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides an inspection steel wire is anti salt spray corrosion ability's device under stress condition which characterized in that: the steel wire loading device comprises a top plate, a bottom plate and a steel wire loading screw rod, wherein the top plate and the bottom plate are arranged in parallel;
the top plate and the bottom plate are respectively provided with corresponding steel wire holes which are uniformly arranged at intervals, the lower plane of the top plate is provided with a screw rod positioning mechanism, the bottom plate is provided with a bolt hole corresponding to the screw rod positioning mechanism, the tail end of the steel wire loading screw rod is positioned by the screw rod positioning mechanism, the head part of the steel wire loading screw rod penetrates through the bolt hole on the bottom plate, and the steel wire loading screw rods on the upper side and the lower side of the bolt hole on the bottom plate are respectively provided with a loading nut and a locking;
the steel wire as the inspection object sequentially passes through the corresponding steel wire holes on the top plate and the bottom plate, and two ends of the steel wire are respectively fixed by the anchor cups.
2. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the top plate and the bottom plate are stainless steel plates with the thickness of 20 mm-60 mm.
3. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the diameter of the steel wire holes is phi 5 mm-phi 9mm, and the distance between the steel wire holes is more than 125 mm.
4. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the screw rod positioning mechanism is a counter bore which is pre-processed on the lower surface of the top plate, the diameter of the counter bore is 1.05-1.10 times of the diameter of the anchor cup, and the depth of the counter bore is 2-3 mm.
5. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the bolt holes are through holes with the diameter of 20 mm-30 mm, and the distance is more than 140 mm.
6. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: pier heads are formed at two ends of the steel wire, the diameter of each pier head is not less than 1.5 times of the diameter of the steel wire, and the height of each pier head is not less than 1 time of the diameter of the steel wire.
7. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: the anchor cup is a steel wire monofilament anchor cup with a through hole in the center, wherein the outer diameter of the anchor cup is phi 25mm, the diameter of the through hole is phi 5 mm-phi 8mm, the anchor cup is processed by adopting a strength material with the steel grade of more than 45, and after processing, heavy anti-corrosion paint is coated for corrosion prevention, or stainless steel is adopted.
8. The device for testing the salt spray corrosion resistance of the steel wire in the stress state according to claim 1, wherein: and a pressure sensor is arranged between the anchor cup at the lower end of the steel wire and the lower surface of the bottom plate, and the bottom end of each steel wire is respectively and independently provided with the pressure sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020473995.4U CN212255009U (en) | 2020-04-03 | 2020-04-03 | Device for testing salt spray corrosion resistance of steel wire in stress state |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020473995.4U CN212255009U (en) | 2020-04-03 | 2020-04-03 | Device for testing salt spray corrosion resistance of steel wire in stress state |
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| CN212255009U true CN212255009U (en) | 2020-12-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114905442A (en) * | 2022-06-21 | 2022-08-16 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114905442A (en) * | 2022-06-21 | 2022-08-16 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
| CN114905442B (en) * | 2022-06-21 | 2024-01-30 | 哈尔滨工业大学 | Special fixture for loading and positioning high-strength steel wire |
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Effective date of registration: 20230705 Address after: 214445 Chengchang Industrial Development Zone, Huangtu Town, Jiangyin City, Wuxi City, Jiangsu Province Patentee after: JIANGSU FASTEN STEEL CABLE Co.,Ltd. Patentee after: JIANGSU FAERSHENG ROAD AND BRIDGE TECHNOLOGY Co.,Ltd. Patentee after: Shenzhen Medium Channel Management Center Address before: 214445 Chengchang Industrial Development Zone, Huangtu Town, Jiangyin City, Wuxi City, Jiangsu Province Patentee before: JIANGSU FASTEN STEEL CABLE Co.,Ltd. Patentee before: JIANGSU FAERSHENG ROAD AND BRIDGE TECHNOLOGY Co.,Ltd. |